Materials Literature
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Abstract The BODIPY fluorophore can easily be functionalized at the 3‐ (and 5‐)position(s) with one or two aryl, ethenylaryl and ethynylaryl moieties by palladium‐catalyzed coupling reactions of the 3,5‐dichloroBODIPY derivative using the Stille, Suzuki, Heck and Sonogashira reactions. The fluorescence excitation and…
For nonpolymeric supercooled liquids, the empirical correlation m = 56Tg DeltaCp(Tg)/DeltaHm provides a reliable means of correlating dynamic and thermodynamic variables. The dynamics are characterized by the fragility or steepness index m and the glass transition temperature Tg, while thermodynamics enter in terms of…
Light-driven metallo-organic catalysis: Intramolecular photoelectron transfer in the heterodinuclear complex 1 facilitates the photocatalytic production of hydrogen and the selective hydrogenation of tolane to give cis-stilbene. All three well-coordinated parts of the supramolecular system are essential: the (tbbpy)2R…
This paper is concerned with the elastic buckling analysis of micro- and nano-rods/tubes based on Eringen's nonlocal elasticity theory and the Timoshenko beam theory. In the former theory, the small scale effect is taken into consideration while the effect of transverse shear deformation is accounted for in the latter…
Hydrolysis of cellulose to glucose in aqueous media catalyzed by the cellulase enzyme system suffers from slow reaction rates due in large part to the highly crystalline structure of cellulose and inaccessibility of enzyme adsorption sites. In this study, an attempt was made to disrupt the cellulose structure using th…
Small solid particles adsorbed at liquid interfaces arise in many industrial products and process, such as anti-foam formulations, crude oil emulsions and flotation. They act in many ways like traditional surfactant molecules, but offer distinct advantages. However, the understanding of how these particles operate in…
The ability to generate regular spatial arrangements of particles is an important technological and fundamental aspect of colloidal science. We showed that colloidal particles confined to a few-micrometer-thick layer of a nematic liquid crystal form two-dimensional crystal structures that are bound by topological defe…
We consider a general class of hybrid density functionals with decomposition of the exchange component into short-range and long-range parts. The admixture of Hartree-Fock (HF) exchange is controlled by three parameters: short-range mixing, long-range mixing, and range separation. We study how the variation of these p…
We describe the synthesis of bilayer graphene thin films deposited on insulating silicon carbide and report the characterization of their electronic band structure using angle-resolved photoemission. By selectively adjusting the carrier concentration in each layer, changes in the Coulomb potential led to control of th…
North Carolina State University Theses Textile Engineering, Chemistry and Science.
We present an investigation on spatially resolved studies of electronic transport in nanostructured (NS) films of the colossal magnetoresistive material ${\mathrm{La}}_{0.67}{\mathrm{Sr}}_{0.33}{\mathrm{MnO}}_{3}$. The NS films (thickness $\ensuremath{\approx}500\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$) were grown on f…
Abstract Summary: Homopolyesters based on cis ‐1,4‐butenediol (cBeD) and aliphatic dicarboxylic acids (ADAs) were prepared by three different methods. First, cBeD was polycondensed with the dimethyl esters of ADAs in bulk. Regardless of the catalyst, only low‐molar‐mass polyesters were obtained. Second, polycondensati…
A series of 2,5-thiophene-substituted 1',2',3',4',5'-pentamethylazaferrocene complexes were synthesized and electropolymerized to produce polymers with fully pi-conjugated backbones. The length and hence oxidation potential of the conjugated linker (the thiophene fragments) between the metal centers were varied to und…
The feasibility of light-driven engineering of isolated colloidal silver nanoparticles or, alternatively, of large fractal-type aggregates comprising hundreds to thousands of nanoparticles is investigated. Control over the size and shape of such nanostructures is shown by varying the type of optical irradiation and th…
We calculate the reflectance anisotropy and the reflectance-difference spectra for a clean Si(100) surface and two hydrogen- (H-) covered Si(100) surfaces. The clean surface is a $2\ifmmode\times\else\texttimes\fi{}1$ surface reconstruction, characterized by a tilted dimer formed between the two topmost Si atoms. One…
Temperature-programmed time-of-flight secondary ion mass spectrometry (TP-TOF-SIMS) and temperature-programmed desorption (TPD) have been used to perform a detailed investigation of the adsorption, desorption, and glass-liquid transition of water on the graphite and Ni(111) surfaces in the temperature range 13-200 K.…
The dipole polarizabilities of two families of low-lying structures, cage, and space filling, of the medium-sized ${\mathrm{Au}}_{N}$ $(N=32,38,44,50,56)$ clusters are studied using gradient-corrected density functional theory and finite field method. Both dipole moments and polarizabilities exhibit clear shape-depend…
Catalytic cracking of waste plastics is an interesting option for selectively recovering raw materials or for obtaining fuels. In this paper, a new recycling strategy is proposed, which consists of upgrading the waxes obtained by flash pyrolysis of polyolefins in a FCC (Fluidized Catalytic Cracking) unit. The waxes ha…
From electron spin resonance (ESR), magnetization, and thermoelectric power on the isostructural Mn 2 OBO 3 and Fe 2 OBO 3, we have been able to establish important differences between the magnetic properties of these two compounds. These differences are rationalized on the basis of t 2g versus e g electronic interact…
Abstract Summary: A novel kind of dendronized porphyrin polymers was synthesized by Sonogashira coupling of diethynyl‐functionalized porphyrin monomers and diiodo‐functionalized macromonomers bearing Fréchet‐type dendrons. The encapsulation of red‐light‐emitting porphyrin‐containing conjugated backbones into dendroniz…